HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       18.5 C
MINIMUM AIR TEMPERATURE                       11.9 C
GRASS MINIMUM TEMPERATURE                     13.5 C
RELATIVE HUMIDITY                          52 - 67 PERCENT
RAINFALL                                         0 MM
TOTAL RAINFALL SINCE 1ST JANUARY            2393.8 MM
AGAINST AN AVERAGE OF                       2386.4 MM
 
OTHER STATIONS                MIN                  MAX
KING'S PARK                  11.2 C               18.7 C
WONG CHUK HANG               12.4 C               19.0 C
TA KWU LING                  10.4 C               18.7 C
LAU FAU SHAN                 10.6 C               17.1 C
TAI PO                       10.9 C               17.8 C
SHA TIN                      11.3 C               18.6 C
TUEN MUN                     10.3 C               17.0 C
TSEUNG KWAN O                11.5 C               20.3 C
SAI KUNG                     11.1 C               17.3 C
CHEUNG CHAU                  11.2 C               17.7 C
CHEK LAP KOK                 11.0 C               18.1 C
TSING YI                     11.4 C               19.8 C
SHEK KONG                    10.8 C               18.5 C
TSUEN WAN HO KOON            9.6 C               16.9 C
TSUEN WAN SHING MUN VALLEY   11.0 C               21.3 C
HONG KONG PARK               12.0 C               20.3 C
SHAU KEI WAN                 12.0 C               20.1 C
KOWLOON CITY                 10.8 C               18.8 C
HAPPY VALLEY                 12.6 C               19.2 C
WONG TAI SIN                 11.4 C               19.4 C
STANLEY                      12.6 C               19.3 C
KWUN TONG                    11.2 C               20.7 C
SHAM SHUI PO                 11.4 C               21.1 C
KAI TAK RUNWAY PARK          12.2 C               20.6 C
YUEN LONG PARK               10.9 C               19.0 C
TAI MEI TUK                  10.7 C               20.4 C
 
DURATION OF SUNSHINE (KING'S PARK):              5.6 H
 
THE MEAN UV INDEX RECORDED AT KING'S PARK YESTERDAY WAS 2,
THE UV INTENSITY WAS LOW.
THE MAXIMUM UV INDEX FOR YESTERDAY WAS 5.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):     NO DATA
 
YESTERDAY'S (20 DEC 2020) AVERAGE AMBIENT GAMMA RADIATION
DOSE RATE TAKEN OUTDOORS IN HONG KONG RANGED FROM 0.09 TO
0.15 MICROSIEVERT PER HOUR.  THESE ARE WITHIN THE NORMAL
RANGE OF FLUCTUATION OF THE BACKGROUND RADIATION LEVEL IN
HONG KONG (SEE NOTE). THE AVERAGE DOSE RATES MEASURED AT
THE RADIATION MONITORING STATIONS OVER VARIOUS PARTS OF THE
TERRITORY WERE AS FOLLOWS :
 
STATION                     YESTERDAY'S AVERAGE
                            (MICROSIEVERT/HOUR)
PING CHAU                           0.10
TAP MUN                             0.09
KAT O                               0.11
YUEN NG FAN                         0.12
TAI MEI TUK                         0.12
SHA TAU KOK                         0.10
KWUN TONG                           0.12
SAI WAN HO                          0.10
KING'S PARK                         0.15
TSIM BEI TSUI                       0.13
CAPE D'AGUILAR                      0.13
CHEK LAP KOK                        0.15

 
NOTE
1.     FROM READINGS TAKEN AT VARIOUS LOCATIONS IN HONG KONG IN THE
       PAST, THE HOURLY MEAN AMBIENT GAMMA RADIATION DOSE RATE MAY 
       VARY BETWEEN 0.06 AND 0.3 MICROSIEVERT PER HOUR. 
       (1 MICROSIEVERT = 0.000001 SIEVERT = 0.001 MILLISIEVERT)
 
2.     TEMPORAL VARIATIONS ARE GENERALLY CAUSED BY CHANGES IN
       METEOROLOGICAL CONDITIONS SUCH AS RAINFALL, WIND AND 
       BAROMETRIC PRESSURE.
 
3.     SPATIAL VARIATIONS ARE GENERALLY CAUSED BY DIFFERENCES IN 
       THE RADIOACTIVE CONTENT OF LOCAL ROCK AND SOIL.
 
4.     THE DATA DISPLAYED IS PROVISIONAL. ONLY LIMITED DATA 
       VALIDATION HAS BEEN CARRIED OUT.

DISPATCHED BY HONG KONG OBSERVATORY AT 00:15 HKT ON 21.12.2020